Perhaps you should try some spelling variations:
passiv » passive, passiven
passiver » passiveer, passivener, passive, passiven, passively
aktivierende » aktivierenden, aktivieren, motivierende
massiv » massive
massivere » massiveere, massiver, massive, massiven
massively » massiveely, massive

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((((passiv OR passiver) OR aktivierende) OR massiv) OR (massivere OR massively)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((passiv or passiver) or aktivierende) or massiv) or (massivere OR massively))".
• Adding a wildcard symbol may retrieve word variants: ((((passiv or passiver) or aktivierende) or massiv) or (massivere OR massively))*.